There are 8 cups/ 4 pints or  16 scoops in 2 quarts of ice cream.
Money that is paid for the use of money is called interest. When you keep your money in a bank savings account, the bank credits your account with interest.
Cost of money refers to the average interest rate at which you are able to borrow money. Think of the cost of money as the rent you have to pay for using someone else's money. Yes, there is a cost of money even if you are using all of your own money.